2019 · Q21
A trader sells two computers at the same price, making a profit of 30% on one and a loss of 30% on the other. What is the net loss or profit percentage on the transaction?
Elementary MathematicsProfit and Loss
- A6% loss
- B6% gain
- C9% loss
- D9% gain
Explanation
With equal selling prices, a gain of x% on one and loss of x% on the other always gives a net loss of x^2/100 %. Here 30^2/100 = 9% loss. (The trap is thinking they cancel out.)